Codeforces Problem "Theatre Square" Solution In C Language

1. Codeforces Problem "Theatre Square" Solution In C Language
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5. int n,m,a;
6. main()
7. {
8. scanf("%d%d%d",&n,&m,&a);
9. printf("%lld",(m+a-1ll)/a*((n+a-1)/a));
10. 
    
11. }